add Docker support and production-ready deployment setup

[maheshshinde9100]

Description

This PR introduces complete Docker support for the NyayaSetu-AI application to simplify local development, improve onboarding, and enable production-ready deployment for both the FastAPI backend and React frontend.

The update includes Dockerfiles for both services, Docker Compose orchestration, optimized Docker build configurations, environment-based frontend API configuration, and updated project documentation.

Closes #2
Closes #4

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Proposed Changes

Backend

• Added Dockerfile.backend using python:3.10-slim
• Installed required system dependencies for FAISS and backend services
• Configured Uvicorn startup with environment-based port support

Frontend

• Added multi-stage frontend/Dockerfile
• Built React + Vite application in a Node environment
• Configured Nginx for serving the production build

Docker Orchestration

• Added docker-compose.yml for managing frontend and backend services together
• Exposed:
  • Backend → 8000
  • Frontend → 3000
• Added persistent volume mappings for .env, FAISS files, and SQLite database

Build Optimization

• Added .dockerignore files in both root and frontend directories
• Excluded unnecessary files such as:
  • node_modules
  • __pycache__
  • .git
  • local environment folders

Configuration Improvements

• Updated frontend/src/services/api.js
• Added support for configurable backend URLs using:

  VITE_API_URL

Documentation

• Updated README.md with:
  • Docker setup instructions
  • Simplified startup steps
  • Corrected repository/project structure

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Benefits

• Consistent Development Environment
  Ensures all contributors use the same setup across systems.

• Easy Onboarding
  Developers can start the full stack using:

  docker-compose up --build

• Production-Ready Deployment
  Provides containerized infrastructure suitable for deployment platforms and cloud hosting.

• Optimized Docker Builds
  Reduced image size and faster build times using .dockerignore and multi-stage builds.

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How to Test

1. Install Docker and Docker Compose
2. Create a root .env file:

   GROQ_API_KEY=your_api_key

3. Run:

   docker-compose up --build

4. Verify services:
   • Frontend → http://localhost:3000
   • Backend → http://localhost:8000

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Files Added / Updated

• .dockerignore
• Dockerfile.backend
• docker-compose.yml
• frontend/.dockerignore
• frontend/Dockerfile
• frontend/src/services/api.js
• README.md